The phrase "a string of demonstrations" is correct and usable in written English.
It can be used to describe a series of events or actions that are presented in succession, often to illustrate a point or to showcase a particular skill or concept.
Example: "The conference featured a string of demonstrations that highlighted the latest advancements in technology."
Alternatives: "a series of demonstrations" or "a sequence of demonstrations".
Its announcement last October set off a string of demonstrations.
That election bid was another in a string of demonstrations of feistiness.
It would be the latest in a string of demonstrations since the spring: in New Orleans, Pikeville, Ky., and Charlottesville, Va.
In Yemen, prices for bread and other foods have nearly doubled in the past four months, setting off a string of demonstrations and riots in which at least a dozen people were killed.
In a string of demonstrations last week at an aviation center in Chengdu, in central China, the fighter taxied down a runway on Wednesday, then reappeared on Thursday for another high-speed runway test, almost taking off before parachutes popped out and slowed it to a halt.
Fans held a sit-down protest outside the ground before Saturday's game, the latest in a string of demonstrations against owner Roland Duchatelet.
Their alfresco round table was among the Iraqi government's attempts to demonstrate that it was in control after a string of violent demonstrations convulsed the country, challenging the tenuous security situation.
Building on the momentum from a string of previous demonstrations, a group of Chicago fast food workers gathered early Thursday calling for higher wages.
Thousands of low-wage workers protested for higher wages outside McDonald's headquarters last year, one of a string of related demonstrations reported in recent years.
Popular fury over the massacre – and recurring allegations of state involvement – have helped bring hundreds of thousands of protesters to a string of anti-government demonstrations over recent weeks.
What ensued was a string of death fasts and festive demonstrations widely known here as the anti-corruption movement.
